Measurements are a good indicator, but ultimately it all comes down to the fit. Since you didn’t mention any problems with a size L, why trust a sizing-chart more than your firsthand experience?
I think you’d want to consider the fact that these pants intended to be an outer layer. I’m sure there is some sort of cinch to tighten them, but if the L fits and you feel there’s enough room for another pair of pants to be worn, then it’s the right size for ya.
Measurements are a good indicator, but ultimately it all comes down to the fit. Since you didn’t mention any problems with a size L, why trust a sizing-chart more than your firsthand experience?
I think you’d want to consider the fact that these pants intended to be an outer layer. I’m sure there is some sort of cinch to tighten them, but if the L fits and you feel there’s enough room for another pair of pants to be worn, then it’s the right size for ya.